US3841805A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw liner
Assignee: Warren Pumps LLC
•
Filing: 1973-04-04
•
Granted: 1974-10-15
•
Expires: 1993-04-04
Abstract
Abstract A replaceable flight liner for screw flights in screws of the type adapted for pumping fluid-like material (especially thick, fibrous suspensions) through a casing. The liner is suitable for use on screws subject to short life because of screw flight wear on outside surfaces. It is expected that a plurality of such liners would be worn out before other, more extensive repairs to a pump would be necessary.
Inventors
- 👤 A Zalis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:51
CPC Classifications
F; F04; F04C; F04C13/00; F04C13/001; F04C13/002; B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/507; B29C48/509; F04C2/00; F04C2/08; F04C2/082; F04C2/084; B29C48/03
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
181 words
A replacable flight liner for screw flights in screws of the type adapted for pumping fluid-like material through a casing member housing such screw, said flight liner comprising A. a spirally extending, elongated rigid strip having 1. generally radial symmetry with respect to a longitudinal axis. 2. a longitudinal, axially extending average outer width generally greater than the thickness thereof except at opposite end regions thereof, 3. generally parallel, opposed inner and outer faces, 4. said inner face having a radius and a longitudinal, axially extending average inner width adapted to make said inner face be in face-to-face engagement with the circumjacent flight surfaces of a pumping screw, B. hard surfacing means integrally imbedded in said outer face and continuously extending over the mid Region thereof generally between opposed, longitudinally adjacent, axially extending edge regions thereof, and C. demountable mounting means secured to each longitudinally opposite end portion of said strip and adapted to secure said strip to the pumping screw in fixed spatial relationship, said mounting means being radially positioned so as not to extend outwardly of said outer face.
Claim 2
Dependent Claim
181 words
A replacable flight liner for screw flights in screws of the type adapted for pumping fluid-like material through a casing member housing such screw, said flight liner comprising A. a spirally extending, elongated rigid strip having 1. generally radial symmetry with respect to a longitudinal axis. 2. a longitudinal, axially extending average outer width generally greater than the thickness thereof except at opposite end regions thereof, 3. generally parallel, opposed inner and outer faces, 4. said inner face having a radius and a longitudinal, axially extending average inner width adapted to make said inner face be in face-to-face engagement with the circumjacent flight surfaces of a pumping screw, B. hard surfacing means integrally imbedded in said outer face and continuously extending over the mid Region thereof generally between opposed, longitudinally adjacent, axially extending edge regions thereof, and C. demountable mounting means secured to each longitudinally opposite end portion of said strip and adapted to secure said strip to the pumping screw in fixed spatial relationship, said mounting means being radially positioned so as not to extend outwardly of said outer face.
Claim 3
Dependent Claim
19 words
a longitudinal, axially extending average outer width generally greater than the thickness thereof except at opposite end regions thereof,
Claim 4
Dependent Claim
19 words
a longitudinal, axially extending average outer width generally greater than the thickness thereof except at opposite end regions thereof,
Claim 5
Dependent Claim
23 words
The flight liner of claim 1 wherein said strip has an average inner width which is generally substantially greater than the thickness thereof.
Claim 6
Dependent Claim
7 words
generally parallel, opposed inner and outer faces,
Claim 7
Dependent Claim
7 words
generally parallel, opposed inner and outer faces,
Claim 8
Dependent Claim
179 words
mounting means at each longitudinally opposite end portion of said strip and adapted to demountably secure said strip to the rotor associated with each of said flights, respectively, E. each rotor having a single, spirally extending flight whose circumferentially located, peripheral edge portions are parallel to the axis of said rotor, the depth of said flight being at least as great as the average width of said edge portions thereof, F. each rotor further having shaft means axially projecting from opposite end portions thereof such that there is defined at such end portions a pair of generally radially extending shoulders, and G. said mounting means for each of said liners comprising a pair of end plates, each one being welded to a different longitudinally opposite end portions of said strip and being adapted to be in face to face engagement with a different one of said shoulders when said strip is so engaged with its associated flight on each rotor, said end plates and said shoulders having substantially aligned bores adapted for recipt of mounting bolt means thereinto extending.
Claim 9
Dependent Claim
179 words
mounting means at each longitudinally opposite end portion of said strip and adapted to demountably secure said strip to the rotor associated with each of said flights, respectively, E. each rotor having a single, spirally extending flight whose circumferentially located, peripheral edge portions are parallel to the axis of said rotor, the depth of said flight being at least as great as the average width of said edge portions thereof, F. each rotor further having shaft means axially projecting from opposite end portions thereof such that there is defined at such end portions a pair of generally radially extending shoulders, and G. said mounting means for each of said liners comprising a pair of end plates, each one being welded to a different longitudinally opposite end portions of said strip and being adapted to be in face to face engagement with a different one of said shoulders when said strip is so engaged with its associated flight on each rotor, said end plates and said shoulders having substantially aligned bores adapted for recipt of mounting bolt means thereinto extending.
Claim 10
Dependent Claim
28 words
mounting means at each longitudinally opposite end portion of said strip and adapted to demountably secure said strip to the rotor associated with each of said flights, respectively.
Claim 11
Dependent Claim
28 words
mounting means at each longitudinally opposite end portion of said strip and adapted to demountably secure said strip to the rotor associated with each of said flights, respectively.
Claim 12
Dependent Claim
7 words
generally parallel, opposed inner and outer faces,
Claim 13
Dependent Claim
7 words
generally parallel, opposed inner and outer faces,
Claim 14
Dependent Claim
19 words
a longitudinal, axially extending average outer width generally greater than the thickness thereof except at opposite end regions thereof,
Claim 15
Dependent Claim
19 words
a longitudinal, axially extending average outer width generally greater than the thickness thereof except at opposite end regions thereof,
Claim 16
Dependent Claim
7 words
generally parallel, opposed inner and outer faces,
Claim 17
Dependent Claim
7 words
generally parallel, opposed inner and outer faces,
Claim 18
Dependent Claim
124 words
said inner face being in face to face engagement with said peripheral edge portions, and D. demountable mounting means secured to each longitudinally opposite end portion of said strip and adapted to secure said strip to said prechosen pumping screw in fixed spatial relationship to said screw body at said shoulder, said demountable mounting means comprising a pair of end plates, each one welded to a different longitudinally opposite end portion of said strip and adapted to be in face to face engagement with a different one of said shoulders when said strip is functionally positioned on said screw body, said end plates and said shoulders, respectively, when so functionally positioned having substantially aligned bores adapted for receipt of mounting bolt means extending thereinto.
Claim 19
Dependent Claim
124 words
said inner face being in face to face engagement with said peripheral edge portions, and D. demountable mounting means secured to each longitudinally opposite end portion of said strip and adapted to secure said strip to said prechosen pumping screw in fixed spatial relationship to said screw body at said shoulder, said demountable mounting means comprising a pair of end plates, each one welded to a different longitudinally opposite end portion of said strip and adapted to be in face to face engagement with a different one of said shoulders when said strip is functionally positioned on said screw body, said end plates and said shoulders, respectively, when so functionally positioned having substantially aligned bores adapted for receipt of mounting bolt means extending thereinto.
Claim 20
Dependent Claim
15 words
said inner face being in face to face engagement with said peripheral edge portions, and
Claim 21
Dependent Claim
15 words
said inner face being in face to face engagement with said peripheral edge portions, and
Claim 22
Dependent Claim
23 words
The flight liner of claim 1 wherein said hard surfacing has a thickness not greater than one half the thickness of said strips.
Claim 23
Dependent Claim
7 words
generally parallel, opposed inner and outer faces,
Claim 24
Dependent Claim
7 words
generally parallel, opposed inner and outer faces,
Claim 25
Dependent Claim
106 words
said inner face having a radius and a longitudinal, axially extending average inner width adapted to make said inner face be in face-to-face engagement with the circumjacent flight surfaces of a pumping screw, B. hard surfacing means integrally imbedded in said outer face and continuously extending over the mid Region thereof generally between opposed, longitudinally adjacent, axially extending edge regions thereof, and C. demountable mounting means secured to each longitudinally opposite end portion of said strip and adapted to secure said strip to the pumping screw in fixed spatial relationship, said mounting means being radially positioned so as not to extend outwardly of said outer face.
Claim 26
Dependent Claim
106 words
said inner face having a radius and a longitudinal, axially extending average inner width adapted to make said inner face be in face-to-face engagement with the circumjacent flight surfaces of a pumping screw, B. hard surfacing means integrally imbedded in said outer face and continuously extending over the mid Region thereof generally between opposed, longitudinally adjacent, axially extending edge regions thereof, and C. demountable mounting means secured to each longitudinally opposite end portion of said strip and adapted to secure said strip to the pumping screw in fixed spatial relationship, said mounting means being radially positioned so as not to extend outwardly of said outer face.
Claim 27
Dependent Claim
63 words
hard surfacing means integrally imbedded in its outer face and continuously extending over the mid-region thereof generally between opposed, longitudinally adjacent, axially extending edge portions thereof, and D. demountable mounting means secured to each longitudinally opposite end portion of said strip and adapted to secure said strip to said prechosen pumping screw in fixed spatial relationship to said screw body at said shoulder.
Claim 28
Dependent Claim
63 words
hard surfacing means integrally imbedded in its outer face and continuously extending over the mid-region thereof generally between opposed, longitudinally adjacent, axially extending edge portions thereof, and D. demountable mounting means secured to each longitudinally opposite end portion of said strip and adapted to secure said strip to said prechosen pumping screw in fixed spatial relationship to said screw body at said shoulder.
Claim 29
Dependent Claim
145 words
said inner face having a radius and a longitudinal, axially extending average inner width adapted to make said inner face be in face-to-face engagement with the circumjacent flight surfaces of a pumping screw, B. hard surfacing means integrally imbedded in said outer face and continuously extending over the mid region thereof generally between opposed, longitudinally adjacent, axially extending edge regions thereof, and C. demountable mounting means comprising a pair of end plates, each one welded to a different longitudinally opposite end region of said strip and adapted to be in face-to-face engagement with a different longitudinally opposite generally radially extending end portion of the pumping screw when said flight liner is functionally positioned on the pumping screw, said end plates having bores adapted to be functionally positioned in substantially aligned relationship with corresponding bores in the screw for receipt of mounting bolt means extending therethrough.
Claim 30
Dependent Claim
145 words
said inner face having a radius and a longitudinal, axially extending average inner width adapted to make said inner face be in face-to-face engagement with the circumjacent flight surfaces of a pumping screw, B. hard surfacing means integrally imbedded in said outer face and continuously extending over the mid region thereof generally between opposed, longitudinally adjacent, axially extending edge regions thereof, and C. demountable mounting means comprising a pair of end plates, each one welded to a different longitudinally opposite end region of said strip and adapted to be in face-to-face engagement with a different longitudinally opposite generally radially extending end portion of the pumping screw when said flight liner is functionally positioned on the pumping screw, said end plates having bores adapted to be functionally positioned in substantially aligned relationship with corresponding bores in the screw for receipt of mounting bolt means extending therethrough.
Claim 31
Dependent Claim
36 words
A replaceable flight liner for screw flights in screws of the type adapted for pumping fluid-like material through a casing member housing such screw, said flight liner comprising -A. a spirally extending, elongated rigid strip having
Claim 32
Dependent Claim
36 words
A replaceable flight liner for screw flights in screws of the type adapted for pumping fluid-like material through a casing member housing such screw, said flight liner comprising -A. a spirally extending, elongated rigid strip having
Claim 33
Dependent Claim
112 words
A screw assembly adapted for pumping fluid-like material through a casing member housing said screw, said screw assembly comprising A. a screw body having a single, spirally extending flight whose circumferentially located, peripheral edge portions are parallel to the axis of said screw body, the depth of said flight being at least as great as the average width of said edge portions thereof, B. shaft means axially projecting from opposite end portions of said screw body and defining together with each such opposite end portions of said screw body, a pair of generally radially extending shoulders, C. a spirally extending, elongated, rigid strip circumferentially extending about said screw body, said strip having
Claim 34
Dependent Claim
112 words
A screw assembly adapted for pumping fluid-like material through a casing member housing said screw, said screw assembly comprising A. a screw body having a single, spirally extending flight whose circumferentially located, peripheral edge portions are parallel to the axis of said screw body, the depth of said flight being at least as great as the average width of said edge portions thereof, B. shaft means axially projecting from opposite end portions of said screw body and defining together with each such opposite end portions of said screw body, a pair of generally radially extending shoulders, C. a spirally extending, elongated, rigid strip circumferentially extending about said screw body, said strip having
Claim 35
Dependent Claim
32 words
The screw assembly of claim 5 wherein the interrelationship between said screw body and said strip is such that said strip has a width which is substantially greater than the thickness thereof.
Claim 36
Dependent Claim
112 words
A screw assembly adapted for pumping fluid-like material through a casing member housing said screw, said screw assembly comprisiNg A. a screw body having a single, spirally extending flight whose circumferentially located, peripheral edge portions are parallel to the axis of said screw body, the depth of said flight being at least as great as the average width of said edge portions thereof, B. shaft means axially projecting from opposite end portions of said screw body and defining together with each such opposite end portions of said screw body, a pair of generally radially extending shoulders, C. a spirally extending, elongated, rigid strip circumferentially extending about said screw body, said strip having
Claim 37
Dependent Claim
112 words
A screw assembly adapted for pumping fluid-like material through a casing member housing said screw, said screw assembly comprisiNg A. a screw body having a single, spirally extending flight whose circumferentially located, peripheral edge portions are parallel to the axis of said screw body, the depth of said flight being at least as great as the average width of said edge portions thereof, B. shaft means axially projecting from opposite end portions of said screw body and defining together with each such opposite end portions of said screw body, a pair of generally radially extending shoulders, C. a spirally extending, elongated, rigid strip circumferentially extending about said screw body, said strip having
Claim 38
Dependent Claim
104 words
Apparatus adapted for rotary screw pumping of thick fibrous suspensions containing matted concentrations of fibrous content comprising A. a casing having parallel, overlapping bores, B. oppositely rotating rotors extending axially of said bores and providing continuous helical intermeshing pumping flights within said bores, C. an intake chamber for said pump associated with said casing and communicating with said bores and across which said rotors are extended, said intake chamber having side and bottom walls adapted to contain on entering such suspension, and D. a replaceable liner facing the circumferentially located peripheral edge portions of each of said pumping flights, each of said liners comprising
Claim 39
Dependent Claim
104 words
Apparatus adapted for rotary screw pumping of thick fibrous suspensions containing matted concentrations of fibrous content comprising A. a casing having parallel, overlapping bores, B. oppositely rotating rotors extending axially of said bores and providing continuous helical intermeshing pumping flights within said bores, C. an intake chamber for said pump associated with said casing and communicating with said bores and across which said rotors are extended, said intake chamber having side and bottom walls adapted to contain on entering such suspension, and D. a replaceable liner facing the circumferentially located peripheral edge portions of each of said pumping flights, each of said liners comprising
Claim 40
Dependent Claim
104 words
Apparatus adapted for rotary screw pumping of thick fibrous suspensions containing matted concentrations of fibrous content comprising A. a casing having parallel, overlapping bores, B. oppositely rotating rotors extending axially of said bores and providing continuous helical intermeshing pumping flights within said bores, C. an intake chamber for said pump associated with said casing and communicating with said bores and across which said rotors are extended, said intake chamber having side and bottom walls adapted to contain on entering such suspension, and D. a replaceable liner facing the circumferentially located peripheral edge portions of each of said pumping flights, each of said liners comprising
Claim 41
Dependent Claim
104 words
Apparatus adapted for rotary screw pumping of thick fibrous suspensions containing matted concentrations of fibrous content comprising A. a casing having parallel, overlapping bores, B. oppositely rotating rotors extending axially of said bores and providing continuous helical intermeshing pumping flights within said bores, C. an intake chamber for said pump associated with said casing and communicating with said bores and across which said rotors are extended, said intake chamber having side and bottom walls adapted to contain on entering such suspension, and D. a replaceable liner facing the circumferentially located peripheral edge portions of each of said pumping flights, each of said liners comprising
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |